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Electrochromic mixed films based on WO3 and MoO 3, obtained by an APCVD method♣

T. IVANOVA1,* , K. A. GESHEVA1, M. KALITZOVA2, F. HAMELMANN3, F. LUEKERMANN4, U. HEINZMANN4

Affiliation

  1. Central Laboratory for Solar Energy and New Energy Sources, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  3. Malibu GmbH&Co KG, Bielefeld, Germany
  4. University of Bielefeld, Department of Physics, 100 131, 33501 Bielefeld, Germany

Abstract

Electrochromism is a reversible effect, for which the transmittance (colour) modulation is induced by an applied external voltage. By changing the polarity, the film returns to its initial state. The low temperature chemical vapour growth processing of thin films of mixed W and Mo oxides is presented. The investigation is related to optimization of the film structure and the related optoelectronic properties as a function of the CVD process parameters. The morphology of the films is determined by SEM microscopy and EDX analysis reveals their compositions. The vibrational properties of the films are investigated by FTIR and Raman spectroscopy. Electrochromic behavior was examined by cyclic voltammetric experiments, performed in a standard three-electrode arrangement. From the cyclic voltammetry data, the optical modulation and colour efficiency (CE) values were estimated. The estimated CE values for a wavelength of 550 nm (the maximum of the solar energy spectrum) are one of the best reported in the literature..

Keywords

CVD, Thin films, Morphology, Electrochromic properties.

Submitted at: Nov. 5, 2008
Accepted at: Oct. 3, 2009

Citation

T. IVANOVA, K. A. GESHEVA, M. KALITZOVA, F. HAMELMANN, F. LUEKERMANN, U. HEINZMANN, Electrochromic mixed films based on WO3 and MoO 3, obtained by an APCVD method♣, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 10, pp. 1513-1516 (2009)